I can't install any addons into Blender
These might be the possible errors:-
1. Check if there is sufficient space in the drive your os is installed.
2. Check if the addon downloaded is of correct windows architecture I.e. 32 bit or 64 bit.
3. Check if the blender version you are using is same as mentioned for the addon.
4. Install a stable blender release instead of nightly build or alpha build. 
5. Check that the python version you are using match the one on which the addon is scripted.
6. Check if the addon is complete and is not missing any command line. 

If it still doesn't work you may have a error or bug report on the respective page.